Interesting, I'm guessing Amazon are doing this as they're concerned at Microsoft getting companies onto Azure as part of a package with Office365.

Articles like this one ( http://www.nasdaq.com/article/can-amazon-alphabet-catch-up-t... ) show that trend quite clearly

That said I'd think it'd be pretty tricky to get something that would compete with Office. Replicating the basic functionality is likely do-able, but the power user functionality of office can be pretty complex (e.g. Macros) and a lot of users are quite attached to it.